Key bolt



July 14, 1925.

V K. F. w. KEMPF KEY BOLT Fild March 1. 1923 Jew-40o:

JIJOkrat,

Patented July 14, 1925.

UNI-1T so STATES P AT E NT OF E 11C E.

KARL F. W. KEMPF, F BUFFALO, NEW YORK, ASSIGNOR To KEY-BOLT APPLIANCE (30., 0F ORCHARD BARK, NEWYOBK; A GOREOBATIO'N'OF'NEW YORK'.

KEYTBO LT.

Application filed. March 1, 1923'. SeriaLNo. 622,176;

ToaZZ whom it may concern:

Be it known. that I,-.I{ARL F. V. KEM F, a citizen of the United States, residing: at Buffalo, inithe county. ofEi-ie andSta-te of 5 New York, have invented. certain new and useful Improvements in. Key Bolts, of which the following is a: specification.

My invention relates tolanimproved keybolt', or what is sometimes termed a; settingup bolt, by'reasonof: the fact that bolts of this type are employed for connecting plates or other elements together preparatory to bolting or; riveting the.sametogether. Key-bolts of this kind now in, general use are constructed of bars of'metal-of arouate or segmentalformation in. cross section, doubled upon/themselves and headed with a space left along a certain'portionof their length to provide a slot: for a key, usually a flat strip of metal of. wedge formation. Bolts of thiskindarecostly'topmduce anddo not possess. the required strength nor length of life to adopt: them for all uses.

It is the object of my invention to provide a solid key-bolt and. so construct the same that it may be used over and over again since the construction and formation prevent bending of the same when driving the key thereinto. Another object of my invention is toi'construct' a-key-bolt of this kindwhereby it can be easily determined in the dark which side the key is to be entered, thus making it pos sible to conveniently use the key-bolt in dark places,- as is often found: necessary.

A further objectroffmy invention is to so construct akey-bolt: that: when the wedge key is driven home,nit WilLhave afull bearing transversely of :the bolt and-.- will' require less power or effort to: drive the key into locking position.

A. still; further-obj test is to. provide a1 keybolt ofth'is kind that will 1 assure a solid conneetion between the key. andgthe bolt so that it will not become loosenedwhen-hammer g rivets or other parts: adjacent to, the keybo-lt.

Still another objeet istov sorc'onstructthe? belt that it' will preventthe: key taking; hold: at: the entrance-2 (If; the? key-slot, thereby guarding against theliey being'driven tight; without full, bearing transversely of the. bolt and also-1 preventing: shavings: being. taken from 1 the wedge; which results: in the boit; being bent;

WVith theabove and other objects in View, the invention consists in tlienovel features of construction and in thearr-angeinent and combination of parts to be hereinafter described and particularly pointed out in; the subj oi'ned claims.

In thedrawings:

Fig. 1 is a sectionalelevation showing the first operation offorming,- the key-slot within the bolt.

- Fig: 2 is a sectional elevation of: thebolt showing the web, created by the first step in the operation, driven from thebolt so as to form the key-slot.

Fig. 3 isa sectional. elevation showing two plates overlapped and drawn into and retained in firm contact; by means of my improved key-bolt.

Fig. t is similar View. showing the keybolt andkey in elevation.

Fig. 5 is a: section taken on line 55; Fig. i; showing. two-spaced key-bolts asapplied i'nFig. 4:, and a'rivetbetween the-two.

When drawing boiler plates, ship; plates or the like together, the. rivet holes are brought into, registration-,- and key-bolts driven through the rivet, holes alternately orin other-spaced:relation;so that by means of the Wedge-keys,- the key-bolts: will. be tightened to; draw the overlappingportions of'the plates into firm contact. Rivets are then passed through the registering, rivet holes between the key-bolts, as illustrated in Fig.- 5. Therefore aftera series of rivets are-passed through theplates-and upset or headed, the key-bolts may be removed and rivets passed throughthe. openings from whichqthe key-bolts are withdrawn.

As clearly showninFig; 5-, the-upsetting of therivets will cause considerable vibration or even jarring; of the plates,. resulting in a tendency to loosen the adjacent. keybolts'. However; from the descriptiomtoafollow, itwillbe'clear thattth-is'tendency isjreduced to the .niginimumbythe usei of: my. improved key-bolts.v

Ase clearly shown; in Fig; 1,- asolidbolt- 6, headedin the usual way butunthreadeda at its opposite end and; having somewhatthe appearance of a long rivetisj; undenproper treatment. provided, at diametrically opposite pointswithtwo." elongated depressions 7 by meansof suitable punch tools 83erran-ged, at o oposit'esides thereof. These punch tools-'1 form; a WBb9 betweenrtheiwvo depressions, which web is also illustrated by dotted lines in Fig. 2.

It is to be noted that the punch tools 8 are. at a slight angle to a plane parallel with the inner side of the head of the bolt. The web 9 is then punched or milled out in any suitable manner so that a key slot 10 is formed in the bolt, said slot having each of its end walls at a slight angle to the inner side of the head of the bolt so that the angularity at the ends of the elongated depressions 7 is continued through the complete width of the slot.

For convenience in describing the invention hereinafter, I have designated the head of the bolt by the numeral 11. 12, 1.3 designate two plates which are overlapped, as at 14, and which are shown drawn into contact with each other and retained in contact by means of my improved key-bolts, preparatory to permanently fastening them together by means of rivets, such as shown at 15, Fig. 5, or otherwise.

lVhen riveting or otherwise permanently securing plates together, the key bolts are inserted at spaced intervals into the rivet or bolt holes, as the case may be, of the plates or other objects to be fastened together, and when the parts are firmly driven together by means of the key bolts, the unoccupied rivet or bolt holes of the plates or other objects between the key bolts are provided with rivets or bolts and the plates or other objects fastened tightly together thereby. After the rivets are properly headed, or the bolts properly tightened,-the key-bolts may be withdrawn so that additional rivet-s or bolts may be used for properly fastening the plates or other objects together.

The entrance end of the key-slot I have designated by the numeral 16, and at the outer or free end of the bolt. a notch '17 is filed. or otherwise formed in the bolt in line with the key-slot and so that the notch extends from the end face of the bolt to the peripheral face thereof adjacent the entrance end of said key slot. Consequently,- after placing the bolt in position through the rivet or bolt holes of a pair of plates or other objects, it will be easy to determine from which end of the key-slot the key 18 is to be inserted into the slot. This key is of wedge formation and formed of a comparatively thin piece of metal. The straight edge 19 of the key is adapted to lie in contact with one side of one of the plates, while the beveled or wedge edge 20 is adapted for engagement with the outer end wall of the key-slot in the bolt.

While it is highly essential that the outer end wall of the key-slot be arranged at a slight angle to a plane parallel with the inner face of the head of the bolt, or with the outer face of the plate from which the I bolt projects, it is not esent-ial that the inner end-wall of said key-slot be so arranged. However, as the method of forming this slot now employed and found to be the most convenient for the purpose,'will give the inner end-wall the same angularity as the outer end-wall of the key-slot, it is so shown in the drawings.

It is to be noted that the angular outer end wall of the key slot 10 is rounded and as clearly shown in Fig. 3, the angularity of said outer end-wall is originally slightly greater than the angularity of the beveled or wedge edge of the keylS, which may also be referred to as the outer edge, with the result that the key will first engage that point of the outer end-wall of said slot, indicated by the numeral 21, which point is close to what may be termed the outlet end of the slot. This results in a slight space 22 being formed between the angular or wedge edge of the key and the outer end wall of said key-slot, said space gradually being reduced from the entrance end of the key-slot to the point 21. For this reason there is a free riding contact between the outer end-wall of the key-slot and the wedge'edge of the key, and all tendency to mutilate said wedge edge by forming depressions therein or working shavings therefrom when driving the key home, is entirely eliminated. Experience has shown that with a difference ofone and one-half degree in the angularity of the outer end-wall of the key-slot and the wedge edge of the key, best results are obtained and less power and effort required to drive the key home, and that when driven home, the key will have a full bearing against the entire length of the outer end-wall of said keyslot.

Owing to the fact that the outer end wall of the key slot 11 is rounded at the outlet end of said slot, the driving of the key through said slot will. cause the metal between said slot and the outer end of the bolt to be condensed without forcing any of said metal outwardly beyond the peripheral face of the bolt, the condensing of the metal be ing greatest at the outlet end of the key slot and being gradually diminished toward the entrance end thereof. A key slot having a sharp angular portion where the outer end wall thereof meets the peripheral face of the bolt at the outlet end of the key slot would result in a portion of the metal being forced outwardly beyond the peripheral face of the bolt when driving the key home, with-the result that it would be difficult to remove the key bolt from the plates, owing to the enlargement of the cross sectional diameter of the bolt at such point.

When driving the key into the key-slot, the tendency of the outer end of the bolt is to ride up on the key, but this tendency is overcome by the blow against the key and the difference in the angularity of the Outer end wall of the key slot and the wedge edge of the key, with the result that the wedge is driven tight with less effort; and when the key is driven home, that portion of the bolt extending outwardly beyond the wedged edge of the key may be imperceptibly bent, but it is invariably found that the metal of the bolt at the pointEZl and in the region between said point and the entrance end of the key-slot will be condensed so that firm contact or the key against the outer endwall of the key-slot takes place along the entire length of said end-wall, without bending said bolt and without in the least mutilating the wedge edge of the key 18. By reason of this action, assurance is had that the key will not become loosened from the bolt, even though rivets are driven and up set in close proximity to the bolt.

I have hereinbefore stated that my improved key bolt is so constructed that it may be used over and over again, but it is to be understood that after being once used, the angularity of the outer end wall of the key slot formed therein will be less than that which it originally had or, in other words, the angularity of said end wall will correspond to the angularity of the wedge edge of the key originally used. Consequently, in order to again use the key bolt for the same purpose and retain the advantages of my in vention, a key having a wedge edge of lesser angularity. than the key first used in connection with the bolt, will be required. How-v ever, where jarring of the parts fastened together by the key bolt does not occur or, where the key does not necessarily have to be firmly driven into the key slot of the bolt, the key bolt may be used indefinitely.

Having thus described my invention, what i claim is 1. A solid key-bolt havingakey-slot transversely therethrough and a head at one end, the outer end wall of said key-slot being at an angle to the inner side of said head, and a wedge key adapted to be driven through said key-slot and having its wedge edge when placed in said key-slot at a lesser angle than the outer end wall of said key-slot so that it first rides in contact with a portion of said end-wall remote from the entrance end of said slot and finally increase its contact along the remaining portion of said end wall when driven into said key-slot.

2. A solid key-bolt having a head at one end and a key-slot whose outer end wall is at an angle to the inner side of said head, and a wedge key adapted to have one 01": its longitudinal edges positioned parallel with the inner side of said head and its other longitudinal edge at an angle to the inner side of said head but at a lesser angle than the angle of said outer end-wall.

3. A key-bolt having ahead at one end and a key-slot whose outer end-wall is at an angle to the inner side of said head, and a key adapted; to be passed through said keyslot having a wedge edge adapted for contact with said outer end-wall, said wedge edge being at a lesser angle to the inner side of said head than said end-wall when the opposite edge of said key is parallel with the inner side of said head.

4. A key-bolt having a head at one end and a key-slot whose outer end-wall is at a slight angle to a plane passing transversely through the bolt at right angles to the axis thereof, and a key adapted to be inserted through said key-slot and having an edge adapted for contact with the outer end-wall of said slot, said edge being at a lesser angle than said end-wall when fitted within said slot and requiring force to tighten the same.

5. A key-bolt having a head at one end and a key-slot whose outer end-wall is at a slight angle to the inner side of said head, the ends of said end-wall being rounded to merge into the peripheral face of said bolt, and a wedge key adapted to first engage said end-wall near one end thereof and when driven into position gradually engage additional portions of said end-wall until in firm contact therewith at all points.

In testimony whereof I afiix my signature.

KARL F. 7. KEMPF. 

